Which of these scientists had the greatest contribution to early microscopy?
2 answers:
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Answer: No. Circuit should be closed.
Explanation:
A changing magnetic field induces emf in a circuit which is placed in it. This induced emf causes current to flow through it. This is given by Faraday's law which states that induced emf results due to rate of change of magnetic flux.
Current flows only through a closed circuit. Thus, when a wire is moved up and down in a magnetic field, it will not induce emf because the wire does not form a loop. It is an open circuit.
Answer:
(a) Work done by the tension force is 987 J
(b) Coefficient of kinetic friction between the crate and surface is 0.495
Explanation:
(a)
Work done by any force F in moving an object by a distance d making an angle with the direction of force is given by
Thus work done by the tension force is 987 J
(b)
Normal force on the crate is given by
=>N=332 Newtons
Since crate is moving with constant speed . Therefore using Newtons second law .
Where =coefficient of kinetic friction
=>
=>
Thus coefficient of kinetic friction between the crate and surface is 0.495